AbstractThree AgCI/AgBrd) cubic emulsion grains were prepared successfully by epitaxial deposition of AgCI on (111) surfaces of three cubo-octahedral AgBr(I) host grains made at various pAg values by a microcomputer-controlled, balanced, double-jet method. Using powder X-ray diffractometry, the component phases of these epitaxial emulsion grains were identified, corresponding to the host AgBr(I) phase and a neio AgCI phase, respectively. The dielectric loss curves of epitaxial grains showed two separated peaks, corresponding to the contribution of the AgBr(I) host phase and epitaxial AgCI to ionic conductivity, respectively. The photoconductivity decay process for both host and epitaxial grains was composed of slower and faster parts, each of which obeys first-order kinetics. The epitaxial procedure modified effectively the amount and mean lifetime of photoelectrons. The photosensitivities of epitaxial emulsions were much higher than those of the host emulsions, which can be attributed to the epitaxial gr...